Add pg_ivm to shared_preload_libraries if enabled

Hello

As discussed with your support team I open this issue to add pg_ivm extension to shared_preload_libraries or session_preload_libraries.

On our staging project and on the local CLI stack, SHOW shared_preload_libraries returns

pg_stat_statements, pg_cron, timescaledb, pg_squeeze, pg_search

Some libraries are preloaded, but pg_ivm is not among them, and both session_preload_libraries and local_preload_libraries are empty. Can pg_ivm be added to shared_preload_libraries, given the list already exists and if not, is CREATE EXTENSION pg_ivm without preloading supported, and what are the limits? Is pg_ivm 1.14 validated against PostgreSQL 18?

Thanks for considering it!